[huttdes]

I going through all of my movies changing the genre option to my liking. Whenever I add a new genre that isn't in my current list (typing manually) it does not appear in the list if I right click and have the check box list popup.
How can I have my new genre's be in that list.... as well as remove genres that I don't want in that list?

You can have a custom list of Genre's
Go to Preferences, Common Settings tab. Look just above the 'Apply & Close' button, and there is a button to create/edit a custom Genre file.

Also, MC3 is telling me I have X amount of movies without posters. Basically its listing movies that I have a poster.jpg file for but not a movie-poster.jpg.
Either works fine for Kodi so I do I MC3 recognize either as being ok?

Interesting, I haven't looked into this area for a while.
Do you have the option in Movie Preferences -> Artwork tab, "If Movies in Folders, Save artwork as:"
and check the box
Save as 'poster.jpg', not moviename-poster.jpg
This should clear it up.

Or is there a way to have it simply copy the existing poster.jpg files to movie-poster.jpg files?

As you have scraped this into Kodi, I wouldn't bother changing them.

But, you can have the above option un-checked, and renaming the Movie will fix the artwork filenaming.
But, this will rename the movie filename as well, possible causing issue in Kodi.

I might add an option to the Debug tab, to allow re-aligning the artwork to the selected file naming convention..... 

Thank you. Got the custom genre's.

As for the artwork... I ticked that option but MC3 is still showing as missing... would refreshing the library fix this?

As for your last comment... about my having already scraped into Kodi... I've already made so many changes I need to remove the library and rescrape anyway. Doing minor OCD changes to many different things to make it all uniform I'm probably altering over half of over 900 movies.
Which leads me to one further question... can MC3 update the Kodi database when I make changes in MC3? Is that what the XBMC link is for?